I've got DSL bootable on a USB memory stick, however I'd like to install it on a USB HDD (uncompressed) if this is possible.

However when I connect my USB HDD DSL does not appear to detect the device (it's a generic case with SATA HDD, it works fine under Windows and also the Wii can see it to display photos etc.). Does anyone have any suggestions on how I can try to force detection and installation please?